Half to robert b



(No Model.)

O. W. ROBISON. DEEP WELL TOOL.

No. 448,165. Patented Mar. 10,1891.

NITED STATES ATENT FFICE.

CHARLES XV. ROBISON, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOR OF ONE HALF TOROBERT E. ROBISON, OFSAME PLACE.

DEEP-WELL TOOL.

SPECIFICATION forming part of Letters Patent No. 448,165, dated March10, 1891. Application filed September 29, 1890. Serial No. 366,444. (Nomodel.)

To all whom it may concern.-

Be it known that I, CHARLES W. Romson, of Allegheny city, in the countyof Allegheny and State of Pennsylvania, have invented a new and usefulImprovement in Deep-Well Tools, of which the following is a full, clear,and exact description, reference being had to the accompanying drawings,forming part of this specification, in which- Figure l is a sideelevation, partly in section, of a drillingtool provided with myimprovement. Fig. 2 is a partial side elevation of the tool, showing thespring locking-tongue. Fig. 3 is a perspective end view of one sectionof the tool. Fig. 4t is a horizontal section on the line IV IV of Fig.2; and Fig. 5 is a perspective view of the washer.

My invention is designed to afford means for detachably locking togetherand preventing accidental separation of the parts of tools and rods usedin drilling deep wells, such as oil and gas wells. Such tools or rodsare commonly secured together by screw-couplings, and the frequency withwhich they become detached in the well and necessitate tedious andexpensive fishing operations to recover them makes my invention of greatvalue to the trade.

In the drawings, 2 3 are the sections of a drilling-tool, adapted to besecured together by a screw-threaded projection at the end of onesection, which fits into a corresponding socket at the end of the other,and around the socket and projections are annular seats or shoulders, asshown.

To the end of one of the sections on the seat around the threadedportion I fix, with screws or otherwise, a divided washer 4, of springmetal, which is set so that one of its divided ends Z) shall constitutea tongue tending to project outwardly, as shown in Figs. 1, 2, 4E, and5. The other section of the tool is formed at its end with one or morenotches 5, made in the form of ratchet-teeth and adapted to engage theprojecting end of the washer when the sections are turned in a directionopposite to that in which they are screwed together; but to slip oversaid end when the parts are turned in the other direction. In practice Iprefer that there should be two of these notches, which may be made atdiametricallyopposite points on the periphery of the tool end.

The operation is as follows: In screwing the sections of the tool or rodtogether, after the projecting tongue of the washer comes in contactwith the end of the section to which it is not fixed said tongue willslip freely over the notches 5, but will prevent the sections from beingunscrewed, for, if their turning be reversed in direction, the tongue onmeeting one of the notches will engage its abrupt end and will then lookthe parts. This constitutes a most efficientmeans for preventingaccidental separation of thetool-sections when in use in the well, andtherefore makes the drilling operation saferand less apt to be attendedwith the delay and expense of fishing. hen it is desired to unscrew thesections the bite of the washer may be released by inserting a chisel orother tool into the notch above the end of the tongue and forcing thetongue down to the level of the washer. \Vhen the parts of the tool arescrewed together, they bear vertically upon the washer and confine itsecurely in place, so that sand and dirt cannot enter behind it andforce it out laterally. The security and compactness of the joint thusoccasioned form the principal feature of advantage of my invention.

I claim- The combination, with the sections of a deep-well tool having-ascrew-threaded projection and a surrounding shoulder or seat on one partand a corresponding threaded socket and surrounding seat on the otherpart, of an annular locking-washer having a projecting spring-tongue,being adapted to encircle the threaded projection and fixed laterally tothe seat of one of the said parts, and the other of said parts having onits seat a ratchet notch or notches adapted to engage with said tongue,substantially as and for the purpose described.

In testimony whereof I have hereunto set my hand this 26th day ofSeptember, A. D. 1890.

CHARLES XV. ROBISON.

itnesses:

W. B. CoRwIN, II. M. CORWIN.

